Geometry Nodes: Smooth Your Mesh with a Custom Smooth Node

Richard van der Oost writes:

I recently ran into a frustrating situation while working with Geometry Nodes: I needed to smooth some part of a mesh, but there is no Smooth Mesh node yet..

With of all the amazing nodes we do have that allow you to pull out information out of the geometry, I thought maybe there is a way to create one.

After a lot of experimentation I sort of stumbled into a very robust way to get a nice smoothing effect, with pure Geometry Nodes, no other modifiers. So I thought it would be cool to share the trick this article and video.